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首页> 外文期刊>Aquatic Sciences >Alien aquatic plants do not have higher fragmentation rates than native species: a field study from the River Erft
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Alien aquatic plants do not have higher fragmentation rates than native species: a field study from the River Erft

机译：外来水生植物没有比本地物种更高的破碎率：来自埃尔夫特河的田野研究

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摘要

Aquatic plants mostly disperse via vegetative means, and plant fragments are the most important vegetative dispersal units. Here we studied the fragment drift in the medium sized River Erft, in which the macrophyte community is dominated by alien aquatic plants. The plant fragments were sampled at six different sites in the drift of the river. We analyzed the drifting biomass, the number of fragments and the number of propagation units (based on the known minimum size of fragments needed for regeneration of each species) as potential propagation units. Overall, we sampled > 13,000 drift units of various sizes, from short stem fragments < 1 cm up to the largest containing > 400 connected plants (Vallisneria spiralis), resulting in > 500,000 propagation units. The total number of sampled drift units and propagation units were significantly higher for native than for alien plant species. The number of sampled drift units and biomass was correlated with the total plant mass (TPM, calculated from species abundances per river section and section lengths) of the species in the river. However, the highest numbers of drift and propagation units per unit TPM were found for the four natives Ceratophyllum demersum, Potamogeton pectinatus, Potamogeton crispus and Myriophyllum spicatum, contributing to more than 75 % of the total number of fragments sampled. Conversely, lowest numbers of drift units were found for alien plants Hygrophila polysperma and Hydrocotyle ranunculoides, and no drift units were collected for four aquatic plant species in the river (alien Myriophyllum aquaticum and natives Nuphar lutea, Potamogeton nodosus and Sparganium emersum).
机译：水生植物主要通过营养方式扩散，而植物碎片是最重要的营养扩散单位。在这里，我们研究了中型Erft河中的碎片漂移，其中大型植物群落以外来水生植物为主。在河水漂流的六个不同地点对植物碎片进行了采样。我们分析了漂移生物量，碎片数量和繁殖单位的数量（基于每个物种再生所需的已知最小碎片尺寸）作为潜在的繁殖单位。总体而言，我们从1厘米以下的短茎碎片到包含400多个相连植物（Vallisneria spiralis）的最大茎，取样了超过13,000个各种大小的漂移单位，从而得到了超过500,000个繁殖单位。本地的漂移单元和传播单元的采样总数明显高于外来植物物种。采样的漂流单位和生物量与河流中物种的总植物质量（TPM，根据每条河段的物种丰度和截面长度计算）相关。但是，发现四个本地人Ceratophyllum demersum，Potamogeton pectinatus，Potamogeton crispus和Myriophyllum spicatum的每单位TPM漂移和传播单位数量最多，占采样碎片总数的75％以上。相反，在外来植物多毛潮藻和水生毛Hydro中发现的漂移单位数量最少，在河流中（水生Myriophyllum aquaticum和本地人Nuphar lutea，Nodosus Potosgeton和Sparganium emerum）的四种水生植物没有采集到漂移单位。

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  • 来源
    《Aquatic Sciences》 |2016年第4期|767-777|共11页
  • 作者

    Heidbuechel Patrick; Kuntz Katharina; Hussner Andreas;

  • 作者单位

    Univ Dusseldorf, Stress Physiol & Photosynth Plants, Univ Str 1,Geb 26-13-O2, D-40225 Dusseldorf, Germany;

    Univ Dusseldorf, Stress Physiol & Photosynth Plants, Univ Str 1,Geb 26-13-O2, D-40225 Dusseldorf, Germany;

    Univ Dusseldorf, Stress Physiol & Photosynth Plants, Univ Str 1,Geb 26-13-O2, D-40225 Dusseldorf, Germany;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dispersal; Allofragment; Regeneration; Plant invasion;

    机译：分散;全碎片化;再生;植物入侵;

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